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Re: 64bit replacement of ntvdm

Posted on 2020-06-13, 18:14

in DOS
Why vga memory range cannot be mapped same way as lfb to not cause vmexit on every single access? I though that most vmexits are caused by i/o access but there shouldnt be it so many for vga rendering, needed for setting a palete or switching bakns in vesa banked mode. Again vmware from my view …

Re: 64bit replacement of ntvdm

Posted on 2020-06-13, 08:53

in DOS
Yes, rigt, I got working only accelerated VT-X QEMU using HAXM - the 3Dfx build from other thread on this forum but as was told HAXM QEMU crashed with DPMI applications so I cannot benchmark it. Is there other version for windows? So i tried only unaccelerated QEMU. Under linux i didn't tried accel …

Re: 64bit replacement of ntvdm

Posted on 2020-06-12, 23:09

in DOS
VESA LFB mode: 1024x768/32 LFB PCem 15 - 49 MB/s DOSBox 0.74 - 978 MB/s various QEMU - 744-934 MB/s VirtualBox 5.2 - 18452 MB/s Vmware 15 - 19112 MB/s DOSEMU 1.4.0.7 - 22943 MB/s So more than a magnitude difference, it must be due to different approach. But in this case I'm not hunting GFX …

Re: 64bit replacement of ntvdm

Posted on 2020-06-12, 16:09

in DOS
Hi, OK, I just installed this non-HAXM version on Win10-x64 10.0.16299.611 without any error. This means all DOS programs exec through slower CCPU but should it support DPMI? As I understand the DPMI support limitation, that you talked about, was related only to HAXM version or did you mean both? I …

Re: 64bit replacement of ntvdm

Posted on 2020-06-12, 01:18

in DOS
>DosFreak OK, understand. >Caluser2000 The beauty of NTVDM is that you can run any DOS program in a moment as native win32/64 programs without launching a VM, creating a vdisk and installing guest OS and drivers in, setting up a shared directory, etc. I have a bunch of dos commandline tools that I …

Re: 64bit replacement of ntvdm

Posted on 2020-06-11, 23:17

in DOS
Do we need to be so uber-self-censored? Well leecher, when I see the page it remembers me that I already visited it 2 years ago and I had downloaded the package but didn't had time to try it and completly forgot about it. I can see it was updated since then so I definitely have to give it a try! BTW …

Re: 64bit replacement of ntvdm

Posted on 2020-06-11, 18:38

in DOS
Uh, I hoped that I can just install with precompiled binaries from release directory, I though recompile is only needed if someone wants to build ldntvdm.dll from source but not a must. Does someone here tested it on w10-x64 and could provide precompiled package?

Re: 64bit replacement of ntvdm

Posted on 2020-06-11, 13:20

in DOS
I tired to install NTVDM64 on Win10-x64 from github (via install.bat) but according INF file it requires some more files (pop-up window required for ansi.sys): [SourceDisksFiles.amd64] ldntvdm.dll=1 ansi.sys=3 append.exe=3 autoexec.nt=3 backup.exe=3 bios1.rom=3 bios4.rom=3 ... where can I get this …

Re: Matrox Millennium II 16MB - exists? If so, why?

Posted on 2020-06-10, 23:56

There's no higher resolution with 16MB probably because no higher resolution was defined that times, also there's a limitation by RAMDAC that may not reach at least 60Hz (min. Acceptable for CRT) at higher mode than 1920x1200. More VRAM can be used for multiple video buffers but it may not bring any …

Re: 64bit replacement of ntvdm

Posted on 2020-06-10, 00:28

in DOS
64 bit windows simply won't let you change the Local Descriptor Table. Newer Windows are more restrictive (on Win9x I think even GDT can be changed :) but you should be able to do it via kernel driver (ring 0), I can change any physical memory via KMD, I didn't tried it for LDT - would be some …

Re: 64bit replacement of ntvdm

Posted on 2020-06-09, 10:57

in DOS
I aslo later tested Quake in the same 64-bit dosbox and it was not so slow, quite playable in lower video modes so I wonder that gcc compiling took so much time... Of course I know about DJGPP crosscompiler and virtualization (but I used what I already had on the machine, I didn't want spend extra …

Re: 64bit replacement of ntvdm

Posted on 2020-06-08, 17:48

in DOS
One example where Dosbox really suxx. I needed to recompile one of my DOS tool (really not a big project with ~8 C modules) under DJGPP (GCC 4.8.5) on a work-NTB with Win10-x64 only. So I just kicked in the Dosbox 0.74-x64 and run make there. I wonder it took ~15minutes to compile, every single file …

Re: New sound card project: AWE64 Legacy

Posted on 2020-06-08, 02:10

I appreciate the attempt of making better AWE64 clone as there's not much homemade x86 HW projects on scene. Someone crying for destroying original cards - I agree there are quite plenty of them yet, nothing rare. Thousand times more ended in scrap for metals recycling or trashed on a dump so those …

Re: ISA I/O Interface

Posted on 2020-06-08, 00:17

I have found one broken lik for PLD data: http://www.alexandrugroza.ro/microelectronics/isa-io-interface/_bin/FIRMWARE.JED BTW should we have some on-top thread for (community members) homemade HW? I think it would be pitty if such effort will fall deep under other threads and one need to dig it so …

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